#include<stdio.h>
#include<unistd.h>
#include<stdlib.h>
#include<string.h>
#include<sys/socket.h>
#include<arpa/inet.h>
#define BUF_SIZE 30
void error_handling(char *message);
//验证输入缓冲中是否存在接收的数据
int main(int argc,char *argv[])
{
	int sock;
	struct sockaddr_in send_adr;
	if(argc!=3)
	{
		printf("Usage:%s<IP><port>\n",argv[0]);
		exit(1);
	}
	sock=socket(PF_INET,SOCK_STREAM,0);
	memset(&send_adr,0,sizeof(send_adr));
	send_adr.sin_family=AF_INET;
	send_adr.sin_addr.s_addr=inet_addr(argv[1]);
	send_adr.sin_port=htons(atoi(argv[2]));
	if(connect(sock,(struct sockaddr*)&send_adr,sizeof(send_adr))==-1)
		error_handling("connect() error");
	write(sock,"123",strlen("123"));
	close(sock);
	return 0;
}
void error_handling(char *message)
{
	fputs(message,stderr);
	fputc('\n',stderr);
	exit(1);
}
